Xray-core/proxy/wireguard/bind.go

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package wireguard
import (
"context"
"errors"
"io"
"net"
"net/netip"
"strconv"
"sync"
"github.com/sagernet/wireguard-go/conn"
xnet "github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/transport/internet"
)
type netReadInfo struct {
// status
waiter sync.WaitGroup
// param
buff []byte
// result
bytes int
endpoint conn.Endpoint
err error
}
type netBindClient struct {
workers int
dialer internet.Dialer
dns dns.Client
dnsOption dns.IPOption
reserved []byte
readQueue chan *netReadInfo
}
func (n *netBindClient) ParseEndpoint(s string) (conn.Endpoint, error) {
ipStr, port, _, err := splitAddrPort(s)
if err != nil {
return nil, err
}
var addr net.IP
if IsDomainName(ipStr) {
ips, err := n.dns.LookupIP(ipStr, n.dnsOption)
if err != nil {
return nil, err
} else if len(ips) == 0 {
return nil, dns.ErrEmptyResponse
}
addr = ips[0]
} else {
addr = net.ParseIP(ipStr)
}
if addr == nil {
return nil, errors.New("failed to parse ip: " + ipStr)
}
var ip xnet.Address
if p4 := addr.To4(); len(p4) == net.IPv4len {
ip = xnet.IPAddress(p4[:])
} else {
ip = xnet.IPAddress(addr[:])
}
dst := xnet.Destination{
Address: ip,
Port: xnet.Port(port),
Network: xnet.Network_UDP,
}
return &netEndpoint{
dst: dst,
}, nil
}
func (bind *netBindClient) Open(uport uint16) ([]conn.ReceiveFunc, uint16, error) {
bind.readQueue = make(chan *netReadInfo)
fun := func(buff []byte) (cap int, ep conn.Endpoint, err error) {
defer func() {
if r := recover(); r != nil {
cap = 0
ep = nil
err = errors.New("channel closed")
}
}()
r := &netReadInfo{
buff: buff,
}
r.waiter.Add(1)
bind.readQueue <- r
r.waiter.Wait() // wait read goroutine done, or we will miss the result
return r.bytes, r.endpoint, r.err
}
workers := bind.workers
if workers <= 0 {
workers = 1
}
arr := make([]conn.ReceiveFunc, workers)
for i := 0; i < workers; i++ {
arr[i] = fun
}
return arr, uint16(uport), nil
}
func (bind *netBindClient) Close() error {
if bind.readQueue != nil {
close(bind.readQueue)
}
return nil
}
func (bind *netBindClient) connectTo(endpoint *netEndpoint) error {
c, err := bind.dialer.Dial(context.Background(), endpoint.dst)
if err != nil {
return err
}
endpoint.conn = c
go func(readQueue <-chan *netReadInfo, endpoint *netEndpoint) {
for {
v, ok := <-readQueue
if !ok {
return
}
i, err := c.Read(v.buff)
if i > 3 {
v.buff[1] = 0
v.buff[2] = 0
v.buff[3] = 0
}
v.bytes = i
v.endpoint = endpoint
v.err = err
v.waiter.Done()
if err != nil && errors.Is(err, io.EOF) {
endpoint.conn = nil
return
}
}
}(bind.readQueue, endpoint)
return nil
}
func (bind *netBindClient) Send(buff []byte, endpoint conn.Endpoint) error {
var err error
nend, ok := endpoint.(*netEndpoint)
if !ok {
return conn.ErrWrongEndpointType
}
if nend.conn == nil {
err = bind.connectTo(nend)
if err != nil {
return err
}
}
if len(buff) > 3 && len(bind.reserved) == 3 {
copy(buff[1:], bind.reserved)
}
_, err = nend.conn.Write(buff)
return err
}
func (bind *netBindClient) SetMark(mark uint32) error {
return nil
}
type netEndpoint struct {
dst xnet.Destination
conn net.Conn
}
func (netEndpoint) ClearSrc() {}
func (e netEndpoint) DstIP() netip.Addr {
return toNetIpAddr(e.dst.Address)
}
func (e netEndpoint) SrcIP() netip.Addr {
return netip.Addr{}
}
func (e netEndpoint) DstToBytes() []byte {
var dat []byte
if e.dst.Address.Family().IsIPv4() {
dat = e.dst.Address.IP().To4()[:]
} else {
dat = e.dst.Address.IP().To16()[:]
}
dat = append(dat, byte(e.dst.Port), byte(e.dst.Port>>8))
return dat
}
func (e netEndpoint) DstToString() string {
return e.dst.NetAddr()
}
func (e netEndpoint) SrcToString() string {
return ""
}
func toNetIpAddr(addr xnet.Address) netip.Addr {
if addr.Family().IsIPv4() {
ip := addr.IP()
return netip.AddrFrom4([4]byte{ip[0], ip[1], ip[2], ip[3]})
} else {
ip := addr.IP()
arr := [16]byte{}
for i := 0; i < 16; i++ {
arr[i] = ip[i]
}
return netip.AddrFrom16(arr)
}
}
func stringsLastIndexByte(s string, b byte) int {
for i := len(s) - 1; i >= 0; i-- {
if s[i] == b {
return i
}
}
return -1
}
func splitAddrPort(s string) (ip string, port uint16, v6 bool, err error) {
i := stringsLastIndexByte(s, ':')
if i == -1 {
return "", 0, false, errors.New("not an ip:port")
}
ip = s[:i]
portStr := s[i+1:]
if len(ip) == 0 {
return "", 0, false, errors.New("no IP")
}
if len(portStr) == 0 {
return "", 0, false, errors.New("no port")
}
port64, err := strconv.ParseUint(portStr, 10, 16)
if err != nil {
return "", 0, false, errors.New("invalid port " + strconv.Quote(portStr) + " parsing " + strconv.Quote(s))
}
port = uint16(port64)
if ip[0] == '[' {
if len(ip) < 2 || ip[len(ip)-1] != ']' {
return "", 0, false, errors.New("missing ]")
}
ip = ip[1 : len(ip)-1]
v6 = true
}
return ip, port, v6, nil
}